Ragnarok, at every level you gotta spend your skill and statpoints, when you get high enough you change classes. It is a grind though... and official serv sucks...

Actually in most games I only feel some achievement every 10 lvls or more o-o.. in lots of them gaining a level only means having to face the next monster that are 2 feets away from the last ones you were killing :S

Well I had fun on Monster Hunter Frontier and gaining HRs meant facing new monsters (but since it's a monster hunter it doesn't only mean beating a monster with higher stats, but one that acts completely differently and has different habilities ... well monster hunter games are unique...), but well there isn't any english version for that MMO :S